My husband was diagnosed with severe obstructive sleep apnea and narcolepsy
about 5 years ago and the narcolepsy
is under control with 200 mg of Provigil.
He had hypnogogic hallucinations, body jerks when falling sleep, imaginary conversations with no one, talked in his sleep, fell asleep driving, talking and even in activities you'd never imagine a male would fall asleep.
He appears to always have had it since about puberty but it got worse as his sleep apnea did.